[aarch64-port-dev ] Java callstacks are truncated in perf on aarch64

[Edward Nevill]

On Wed, 2015-05-06 at 12:53 +0100, Andrew Haley wrote:
> On 05/06/2015 12:45 PM, Alexeev, Alexander wrote:
> 
> > As far as I understand this is controversial topic if perf should
> > recognize java frames or JVM has a mode where stacks can be
> > traced. One way or another it is critical for performance tuning to
> > be able to collect performance profiles with call trees, otherwise
> > analysis is too complex.
> 
> It would be nice to have.  Ed Nevill has a patch to support real frame
> pointers, but I don't know if perf will work with that.  That's more
> of a question for perf.

Hi,

I have a mirror patch for Zoltan Majo's patch to preserve the frame
pointer which adds the -XX:+PreserveFramePointer you mention. Zoltan's
patch has been pushed to hs-comp. Once it winds it way through to
jdk9/dev I will file a RFR to push the mirror patch.

All the best,
Ed.